Connected: An Internet Encyclopedia
RFC 1123 - 2.2 Using Domain Name Service

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### 2.2 Using Domain Name Service

Host domain names MUST be translated to IP addresses as described in Section 6.1.

Applications using domain name services MUST be able to cope with soft error conditions. Applications MUST wait a reasonable interval between successive retries due to a soft error, and MUST allow for the possibility that network problems may deny service for hours or even days.

An application SHOULD NOT rely on the ability to locate a WKS record containing an accurate listing of all services at a particular host address, since the WKS RR type is not often used by Internet sites. To confirm that a service is present, simply attempt to use it.

Next: 2.3 Applications on Multihomed hosts

Connected: An Internet Encyclopedia
RFC 1123 - 2.2 Using Domain Name Service